Revealed! Why Zac Efron Bulked Up!

Zac Efron layered some muscle onto that SEKSI frame of his for The Lucky, a movie he just wrapped.

Effron says he packed on 18 pounds (of muscle) for his role as an Iraq War veteran. He insists his training was no where near as difficult as a normal soldier├óΓé¼Γäós, but that ├óΓé¼┼ô[he] was just eating, eating and eating.”

We want shirtless pics!!!

[Image via WENN.com/FayesVision.]